Prueba de generalizacion para enviar notificaciones. Funciona.

screens/main/Home_page.js

   const notificationListener = useRef();
   const responseListener = useRef();
 
+  //const [oneApp, setOneApp] = useState('')
+
 
   useEffect(() => {
     registerForPushNotificationsAsync().then(token => setExpoPushToken(token));
       });
 
       setThreads(threads);
-      console.log(threads);
+      //console.log(threads);
 
       if(loading){
         setLoading(false);
       }
     });
 
-    const cita = firebase.firestore().collection('APPOINTMENTS').where('Day', '==', 8).onSnapshot(snapShot => {
+    const cita = firebase.firestore().collection('APPOINTMENTS').where("participantes", "array-contains", 'qj5xBCSRNoaRMik4UULmslSktLp1').onSnapshot(snapShot => {
       const appointments = snapShot.docs.map(docSnap => {
         return{
           _id:docSnap.id,
           Day:'',
           Month:'',
           Time:'',
-          i_id:'',
-          uid1:'',
+          i_token:'',
+          u_token:'',
           ...docSnap.data()
         };
       });
       setAppointments(appointments);
-      console.log(appointments);
+      console.log("appointment", appointments);
+      //console.log(appointments.Day);
     });
+
+
+    const day = firebase.firestore().collection('APPOINTMENTS').where('Day', '==', 8).get().then((res) => {
+      console.log(`Day is ${res.docs[0].get('Day')}.`);
+      //const dia = return{`${res.doc[0].get('Day')}`};
+    });
+    //console.log("Day", dia);
       
     return () => {
       Notifications.removeNotificationSubscription(notificationListener.current);
   if (loading) {
     return <Loading />;
   }
+   
+  
 
   
   function handleButtonPress() {
           </TouchableOpacity>
         )}
             />
+
+
+            <FlatList style={{
+             flex: 1,
+             width: screenWidth,
+         }}
+          data={appointments}
+          keyExtractor = {item => item._id}
+          ItemSeparatorComponent={() => <Divider />}
+          renderItem={({ item }) => {
+            return (
+              <Button
+              title ='Send notification'
+              onPress={ async () => {
+                await sendPushNotification(item.i_token);
+                }
+              }
+            /> 
+            )
+          }}
+            />
+
+
           <Button
             title ='Send notification'
             onPress={async () => {
           title ='Availability'
           onPress= {() => navigation.navigate('Availability')}
         />
+        <Button
+          title ='Mapa'
+          onPress= {() => navigation.navigate('Map')}
+        />
           <Button
             title ='Logout'
             onPress= {() => firebase.auth().signOut()}